Pneumatic tire



N. G. WARTH.

PNEUMATIC TIRE.

APPLICATION FILED DEc.1o. 1919.

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Application med December lt), 1919. Serial to. 343,837.

To all whom l? may concern.'

Be it known that l, NATHANIEL G. lfl/'An'rrn a citizen of the United States, residing at Grallipolis, in the county of Gallia and State of Ohio, have invented a certain new and useful lmproveinent in Pneumatic rlires, of which the following is a specification.

This invention relates to pneumatic tires and has for its object the provision of a tire of iattened or oblate section adapted to present a broad tread to the ground as distinguished from the narrow or linear tread presented by tires whose cross section is substantially circular.

lt is well known that the confined pressure or a pneumatic. tire tends to cause it to assume a circular cross section hence it an oblate torni is to be maintained it is necessary that means be provided for et ectively resisting that tendency. lt is also important that the resisting means shall not seriously interfere with the general resilience of the tire or contribute by its action in any great degree toward thevdestruction of the carcass and rubber envelope.

'llhe object of the present invention is, therefore, to provide an improved construction in which the oblate torni with its broad tread is eectively maintained, this being accomplished by incorporating permanently in the carcass or casing an endless inexpansible band ot the lproper width and strength to hold the tread in the form desired and yet permit sufficient radial and lateral flexion tor all practical purposes.

vFurther l incorporate this endless inenpansible member at a zone where in the operation ot the-tire it exerts the minimum of destructive action upon the incasing inateiial. @ther objects ot the invention will appear from the :following description.

ln the accompanying drawing illustrating an embodiment of the invention,

l41 igure l.' is a cross section ot the tire and a rim.

Fig. 2 is a cross section ot a modiiication of the ineirpansible member.

llig. 3 is a cross section of still another modied tor/m of inexpansible member.

Referring more particularly to lllig. l the character 5 designates the carcass which is built up by the ordinary process ot several layers of fabric, except that superposed upon the irst innermost layer or two is an endless ineirpansible band t et metal. This band is shown in Fig. l as being plain and dat 1n cross section. llt is made or substanf tial thickness s0 as not t0 be easily bent ori indented and is ot substantially the width ot the tire between its beads 7. The band is primarily made as an endless belt ot steel or hard Iimpenetrable material of uniform cross section at all points and it isv placed within the carcass to lie at all points thereo t substantiall as shown in the cross section llig. l. uperposed upon the carcass 1s the body of solid rubber 8 constituting the' tread or wearing portion of the tire which portion 8 in accord with the present invention, is shown as parallelingain cross section the cross section ot the band 6. ln addition to the endless inexpansible band tl l propose in some instances to introduce between the tread body 8 and the carcass a l metallic band 9.avhich should be equal or nearly equal in width to that ofthe band 6 but can be of thinner metal. 'lhe purpose or this band 9 is to protect the carcass when the tread body is worn down thus f permitting of one or more retreadings ot the tire. This outer band 9 also cooperates with the inner one to prevent over violent or excessive action and deformation ot the inner band.

The body of the casing is, of course, duly vulcanized in the usual way, the metal band or bands being treated in any suitable or lwell known manner 'to secure adhesion of the rubber thereto.

'llhe inner' tube tor inlating the tire is shown l0 and the channel or rim at ll.

'llhe metal band can be perforated as shown in llig., 2 to admit ot more thorough incorporation of rubber therewith or the sewing of the fabric thereto. Further the band can be circumterentially corrugated as shown in the cross section 3. lltfhen so corrugated it can be termed oit metal of lighter gage because of its increased resistance to local flexion.

ln practice the tire thus constructed yields to, a shoclr through a large arc rather than locally near the point where it strilres an obstruction. lin other words there is little tendency to eirion ot the tire the point of contact because such flexion is resisted by the band, the latter tending to yield as a whole or in a large arc thereof carrying with it, ot course, the rubber and carcass with which it is incorporated. The band by reason Ot its width and lateral rigidity lll@ viewed in cross section). Moreover because of this broad form and because the carcass and band move together under the stress of action there is little or no movement of one part relative to the other, suchas is likely to work the separation of the parts and the destruction of the tire as a Whole.

lThe forms of the partscan be changed Without departing from the gist of the invention as claimed. p

What I claim is:

1. A pneumatic tire comprising acasing provided with a carcass, said casing being normally of oblate form in cross section, said casing having incorporated with its carcass at the tread side a band that is inextensible and is straight and rigid in cross section and of substantially the Width of the 2. A pneumatic tire comprising a casingl provided With a carcass, said casing being normally of oblate form in cross section, said casing havin incorporat d with its carcass at each,`the mner and outer sides thereof, a band that is inextensible and is, straight and rigid in cross section andv of substantially the Width of the casing,said bands adapted to prevent expansion ofthe casing from its normal oblate'form upon inflation.

NATHANIEL G. WARTHL 

